Packing-gland structure



Aug. 9,1927. v 1,638,619

A L. D. COLLAR PACKING GLAND STRUCTURE Filed Nov. 25, 1925 INVENTOR. LLOYD. D- COLL/we Patented Au 9, 1927.

LLOYD D. COLLAR, or OAKLAND, CALIFORNIA, ASSIGNOR To ooLLan vALvn coarona'rlon, or OAKLAND, CALIFORNIA, A'coRPoRArIoN or cALrronnIA.

' rAcK mGcLAnD sTRUoTuRE'.

Application filed November 25, 1925. Serial No. 71,322.

This invention relates to valves and particularly pertains to a stem packing gland for valves. 7

It is the principal object of the present invention to provide a stem packing gland for valveswhich will maintain a fluid t-igl'it joint around the stem, eliminate friction between the stem and gland, thus preventing wearing of the stem, and which will permit 19 the valve to automatically center itself relative to its seat.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the l5 accompanying drawings, in which: 7

The figure is an enlarged central vertical section through a self grinding valve disclosing the invention applied thereto;

' Referring more particularly to the accoman in drawin s 10 indicates a valve body P y g a having inlet and outlet openings 11 and 12. A partition wall 14 separates the connections 11 and 12 and is formed with a valve 'aperture having a seat 15. A valve 16 cooperates with the seat and is formed with a stem 17 which extends outwardly through a bonnet assembly 18 on the valve body. This stem is threadedly connected'to a stem block 19 which is reciprocable and which operates 20 against an expansion spring 20' so that the valve will grind on its seat each time it is opened and closed. i

The bonnet assembly of the valve includes a centrally bored bonnet 21 which is counterbored at its outer end co-axially with the valve stem for the reception of a packing gland 22. This packing glandis adapted to T be pressed inwardly into the counterbore in the bonnet by means of a packing nut 23 4 through which the stem extends and which is.

adapted to threadedly engage with the outer end of the bonnet. The gland 22 is formed with a central bore 24 which is of a greater diameter than the valve stem. At its inner 4 end the gland is formed with an inwardly projecting annular lip 25, the interior diam eter of which is but slightly greater than the diameter ofthe valve stem. 7

' When packing is interposed between the inner end of the gland and the end of the I claim and desire to secure Letters Pat counterbore in the valve bonnet, the pressure 1 i exerted by thenut'23, on the gland causes 1 the valve stem to automatically "center in the gland and form a fluid tight joint around the.

valve stem to prevent. leakage therealong', p

The small surfacearea of the lip 25 in the gland permits the valve' stem tomove. slightly from a true axial path when neces'-' sary to properly seat the valve. Thus the effect of the gland will be to permit the valve 6 to automatically adjust itselfto its seat and also to form a fluid tight joint about'the stem.

With theiexception of the lip" 25,,thebore 1 1n the'gland is considerably greater than the valve stem and will not contact therewith, thus eliminating: friction and preventing wearing'of the stem which occurswhen the valve stem is constantly 'frictionally engaged by the bore in the packinggland.

It is seen that by the use of my present invention the valve will be of longer life. As there is no tendency to wear onthe valve stem, repacking of the valve will be required but very infrequently. Also, the valvewill be permitted to slightly. deviate from a true i axial path when the valve is opened and closed so that it will properly seat at all times.

lVhile I have shown my packing structure so ,is illustrated for-a clear"understanding-of the invention only.

While I have shown the preferred form ofv i 1 my invention, it is to be understood that various changes in lts construction may be made by those skilled in the art without de- 0' parting from the spirit of the invention as defined in the appended claim. 7

Having thus described my invention, what entis: V o A packing gland structure foria rotatable or reciprocab le member of circular cross sec tion, said gland structure including an ele% ment through which said member extends,

said element being'counter-bored atone "end, :1

a packing gland member being formed With to the inner, end of said counter-bore, said gland member belngformed with anlnwardly projecting thin annular lip at its:10 i

inner end contacting with the sides of the member whereby the latter may pivot slightly With said lip as a pivot point.

I p LLOYD D COLLAR. 

